either divide by 2 or multiply by 1/2:
side 1= 45 1/4 in = 45.25 /2 = 22.625 = 22 5/8
side 2= (Gusset plate) = ?
5 3/4 in high = 5.75/2 = =2.875 = 2 7/8
3 1/3 in base 3.33/2 = 1.66 = 1 2/3
corner of side 2= 2 inches thick = 2/1 = 1
side 3 (floor plate)= 37 1/4 in = 37.25/2 = 18.625 = 18 5/8